Burglar alarm



Apri 8, 1941. HI WHIPPLE 2,237,644

BURGLAR ALARM Filed Jan. l0, 1940 ven INVENTOF.

`Patented Apr. 8, 1941 vBURGLAR ALARM Henry Whipple, Woodside, Long Island, N. Y., assgnor to Benjamin Goldstone, New York,

Application January 10, 1940, Serial No. 313,259

invention relates to electrically .operated 8 Claims.

burglar .alarms wherein an alarm fis sounded, in the event that the electric source of supply is discontinued, or the circuit is opened from any cause.

One object of :this invention is to provide an electrically operated alarm which lmay be attached to a door and Adoor frame which `operates to close the electric circuit, connected to the alarm, when the door is closed.

Another object .is to -provide automatic means in an alarm of this kind, to maintain the 4electric circuit, connected to the same, in open condition ai'ter the door has been opened, until manually closed.

Another object is to provide -an alarm which may be operated from a plurality of locations or by several controlling loops in the same location.

Another object is to provide an alarm which is simple in design and easy to manufacture while at the same time is eicient and dependable in operation.

Another object is to provide ya burglar -alarm which can .be used locally in -an isolated installation or connected with ya central station as desired, as shown and described 'the embodiment of the invention is adopted especially for use in isolated cases.

Another object is to provide a burglar alarm that can be used equally well on doors, windows,

transom, etc.

Other objects and advantages of this invention -will become more fully apparent as the description thereof proceeds.

Referring to the drawing:

Fig. 1 is a view of the alarm mounted on ya door and door frame and is also, in part, a diagram of electrical connections of the alarm.

Fig. 2 is a diagram of connections of the alarm completing the partial diagram shown in Fig. 1-

Fig. 3 is a top view lof the alarm portion secured to a door frame.

Fig. 4 is a side view of the alarm shown in section 4-4 Fig 3.

Fig 5 is a side view of the alarm shown in section 5 5 Fig. 3.

Fig. 6 is a sectional view of the alarm shown in section 6 6 Fig. 3.

Fig, Z is a sectional view of the alarm shown in section 'l-'I Fig. 1.

Similar numerals apply to the saine parts throughout the several views.

This burglar alarm, while Idescribed as applylng to a door, Acan be used equally well on windows or wherever it can be similarly applied.

The alarm, :as shown, consists essentially of two general parts, .one part Vdesignated hereinafter as `the frame member, .to be mounted on the door frame, and the other part, cooperating with .the first named part, designated as the door member Vto be mounted on the door. When these members vare engaged, by closing the door, the circuit of the alarm is closed `so the alarm cannot ring.

The frame member .is provided with two reflexed clips I secured by screws 9 to two blocks 2 of insulating material, which are spaced and secured by a bolt I0 and screws I3, opposite to each other, on a U-shaped base 3 which in turn is screwed by screws II to .the top of the door frame 3 i. The lower ends 4 of the clips are bent inwardly to normally contact each other as shown at :8 in Fig 6. Below the clips I and blocks 2 and secured at one end .by .rivet I2 to the base 3 is provided a flat spring 5 having mounted thereon a tongue 6 of insulating material secured thereto by means of angle plates l secured to both the spring v5 and the rtongue 6. The flat spring 5 is wider than the space between the blocks 2, so that in its upper normal position it bears resiliently against the bottom .of the blocks 2 as a stop.

The tongue 6 extends above the spring 5 a suiiicient distance to enter between the ends 8 or of the clips 4 when separated as shown in Fig. 7. 'Ihe angle plates '1, secure the tongue 6 to the spring 5, at each end of the tongue 6, thereby leaving 'a space between the rangle plates 1 for the tongue Ii to enter between the clips 4 when separated as shown in Figs. 4 `and 5.

The frame member, -as l*described above, is applicable for one controlling circuit mounted Ion the door, for two similar circuits the above clips and parts are duplicatedas shown in the drawing and may be mounted on a common base 3.

The door member consists substantially of two blades, one long blade VI4 and a shorter one I5, spaced and insulatedfrom each other by a strip of insulating material I6 'to which they maybe secured in anywell known manner. One endlof each blade is secured to the door 'by Aa screw I8 while Vthe other end of the saine yis bent perpendicularly thereto so that the lfree ends of the blades I4 and I5 may enter between the clips 4, when the door is closed, and separate the clips 4 sufciently to allow the tongues 6 to enter between the ends 8 of the clips 4 and maintain them thereby, until the spring .5 is pressed ldown manually .against the 'base 3.

The clips 4 'are separated as Along as `the door I1 is closed and remain so until manually released. After the spring 5 is pressed down, releasing the clips 4, so they come together at their ends 8, the tongue rests slightly against the ends 8 of the clips 4 and bears against the same with initial pressure, reset to enter between the clips as above stated.

The door members may be installed in duplicate as shown, to engage with a duplicate set of frame members, two double door circuits 29, 30 are desired.

Referring to the electrical connections, a battery I9, is connected to the upper right and lower left clip I of the frame member, the remaining clips are connected to a relay 2li). Tracing the electric circuits through the various conductors, the current from the upper terminal of the battery I9 runs to the upper right clip I, andY then through the left blade I4 of the right pair of blades through the loop 30, back to the right blade I5 of the right pair of blades, to the lower right clip I to the magnet 2Q. From the magnet Zilthe current runs to the upper left clip I and then through the right blade I5 of the left .pair of -blades through the loop 29 to the left blade I4 of the left pair of blades to the lower left clip I and kback to the opposite terminal of the battery I9. The armature 2l of the relay 2t controls a circuit to an electric bell 22, the armature 2I being connected in the bell circuit through a contact 23 so that when the relay 2i! is energized., the armature 2l is raised from the contact 23 and the bell circuit is opened and vice versa. A second battery 24 is connected in the bell circuit, to energize the same, and in this circuit is also interpolated a manually operable switch 25 to stop the bell 22 from ringingwhen the contact 23 and armature 2| are closed. Tracing the circuits through the various conductors responsive to the movements of the armature 2I, the current from the right terminal of the battery 24, runs through the switch 25 to the bell 22, and then to the armature contact 23, through thev armature 2| back to the opposite terminal of the battery 2d. The current also runs from the right terminal of the battery 24 through the switch 25 to themagnet 26 to the armature contact 28 and through the armature 2l back to the opposite side'of the battery 24.

In order to maintain the bell ringing after once-starteda second relay 26 has its windings shunted across the bell terminals, and its armature shunted across the armature 2l and terminals 23, so thatif the door I1 were opened, the circuit from the battery I9, to the relay 25, would be opened and the armature 2I would close the bell circuit, causing the bell to ring. lNhen the armature 2l closes the bell circuit, the windings 2B are also energized and the armature 2l is raisedag'ainst the contact 28 thereby closing the bell circuit independently of the armature 2l. The bell will nowv ring continuously until the switch 25 is manually opened.

When the door I'l is 4opened the clips, which are separated by the blades I4 and I5 as explained when the dooris closed, remain separated by reason of the automatic insertion of the tongue 6 between them, otherwise the clips I would come together at their ends 8 as the door Y the `clips I close the circuit at their ends 8 when the door is open.

It is readily understood that many changes and deviations might be made in the details of this invention as disclosed, but obviously these would all come within the scope thereof and would not depart from the spirit of this invention.

Having described one method of carrying out my invention, as required by the statutes, so that anyone skilled in the art to which it pertains could make and use the same, what I claim as my inventionl and wish to secure in Letters Patent is the following:

1. A burglar alarm including a pair of clips insulated from each other, to be secured to a door frame, a pair o f blades insulated from each other, to be secured to the door of said frame in cooperative relation with said clips, effective to enter between the'clips when the door is closed to separate the same, and means associated with the clips to maintain the same spaced, after being separated by the blades.

2. A burglar alarm including a pair of clips insulated from each other, to be secured to the door irame, means associated with the door` of said frame, in cooperative relation with said clips, effective to enter between the clips when the door is closed to separate the same, and means associated with the clips to maintain the same spaced, after beingseparated by the iirst named means.

3. A burglar alarm including a pair of clips insulated from each other to be secured to a door frame, a pair of blades insulated from each other to be secured to the door of said frame in cooperative relation with said clips, eiective to enter between the clips when the door is closed to separate the same, and a spring having an insulating member secured thereto to enter the clips to maintain the same spaced, after being separated by the blades.

4, A burglar alarm including a pair of clips, to be secured to a door frame, insulated from each other and normally in contact, closing an electric circuit, a pair of blades insulated from each other, to be secured to the door of said frame in cooperative relation with said clips, ef-

fective to enter between the clips, when the door is closed, to separate the same and maintain the electric circuit, and means associated with the clips to space the same and maintain the circuit open after the clips are separated by the blades and the blades are removed therefrom.

5. A burglar alarm including a pair of clips insulated from each other, to be secured to a door frame, a pair of blades insulated from each other to be secured to the door of said frame in cooperative relation with said clips, and connected toa control circuit on the door, said blades effective to enter between the clips when the door is closed to separate the same, and interpolate the said circuit between the clips and resiliently supported clips, means to enter between the clips to `maintain the same spaced, after being separated by the blades.

6. A burglar alarm including a pair of reexed clips insulated from each other bent perpendicularly at their free ends to normally contact each other and eiective to be secured to a door frame,

a pair of blades insulated from each other, to be secured to the door of said frame in cooperative relation with said clips, eiective to enter between the clips when the door is closed to separate the same, and means independent of the blades coacting with the clips to maintain the same spaced after being separated by the blades.

7. A burglar alarm, including contacts insulated from each other and interpolated in the circuit of an electric alarm and normally open circuited, to be secured to a door frame, cooperating electric contacts insulated from each other to be actuated by the door of said frame in cooperative relation with said clips :effective to close the circuit of the rst named contacts, when the door is closed, and means associated with the iirst named contacts and responsive to the movements thereof to maintain the circuit thereof closed, independently of the cooperating electric contacts.

8. In a burglar alarm, an electric alarm circuit, including contacts, insulated from each other, to

be secured to a door frame, and V`normally touching each other to close said circuit, blades insulated from each other, mounted o the door of said frame, in cooperative relation with said contacts, to separate the clips, when the door is closed, an electric circuit, carried by said door and interpolated between the blades, effective to be connected in said alarm circuit when the door is closed and means to maintain the clips sepalO rated after the door has been opened.

HENRY WHIPPLE. 

